How does laser vision correction work?

How does laser vision correction work?

LASIK or PRK? Which is right for me? Animation.

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answers (4)

Answer 1
April, 2021
During LASIK eye surgery, an eye surgeon creates a flap in the cornea (A) — the transparent, dome-shaped surface of the eye that accounts for a large part of the eye's bending or refracting power. Then the surgeon uses a laser (B) to reshape the cornea, which corrects the refraction problems in the eye (C).
Answer 2
April, 2021

The ReLEx SMILE procedure lasts about 10 minutes and includes preparing the patient for surgery, local anesthesia and placement of an eyelid speculum, shaping a lenticle in the thickness of the cornea using a femtosecond laser, a 2.5-4 mm corneal incision for extracting the lenticule, removing the lenticule through an incision with a special tool - a spatula. Removing the lenticle changes the curvature of the cornea. As a result, the refractive error of the eye is corrected. Due to the absence of a corneal flap (flap), biomechanical damage to the cornea is minimal. The healing process is individual. In most cases, visual acuity becomes good within 1–2 days after surgery and stabilizes within 2–3 weeks. Already two days after the ReLEx SMILE procedure, the patient can drive a car, work and play sports without glasses and contact lenses. Before the operation, anesthetic drops are instilled into the operated eye. Femtosecond laser (with FemtoLASIK), or a special microkeratome device (with LASIK) - a flap is formed from the surface layers of corneal tissue with a thickness of 90 to 120 microns. The flap is then folded back, exposing the deeper layers of the cornea to the laser beam. The laser beam vaporizes part of the cornea to form a new surface. All laser actions are controlled by a computer, into which a program is loaded with data calculated individually for each patient, determining the amount of laser correction with maximum accuracy. The flap is returned to its place and fixed by collagen - the cornea's own substance. No suturing is required. The restoration of the epithelium along the edge of the flap occurs independently. After the completion of the laser correction, the cornea is washed with a special solution. At the end of the operation, anti-inflammatory drops are instilled into the patient. The whole procedure takes only 15-20 minutes and is painless and safe, with minimal discomfort. Vision returns almost immediately and returns to normal within two weeks.

Answer 3
April, 2021

The PRK (photorefractive keratectomy) operation is performed directly on the surface of the cornea. To evaporate the layers of the cornea to the required depth, the protective layer is first removed - a very thin transparent epithelium. During PRK surgery, the cornea remains devoid of a protective layer. Therefore, vision after such a procedure is not restored immediately: only after the complete restoration of the epithelium, the optics of the eye begin to work in normal mode. The epithelium is re-formed within one to one and a half days, and vision is fully restored in seven to ten days.

Since the surface of the cornea is penetrated with nerve endings, when the epithelium is removed, painful sensations can be quite unpleasant. For this reason, the procedure for laser correction using this technique is never done on both eyes at the same time, but is performed with an interval of 10-14 days.

Antibacterial and analgesic drops are instilled into the eye. As additional protection, special temporary contact lenses are usually issued, which are put on the eye immediately after correction.

During LASIK surgery, the doctor uses a microkeratome to remove the thinnest flap of the upper protective layer of the cornea and remove it to the side, keeping the thin "Leg", as if opening a page of a book. After that, the cornea is processed with a laser beam, which evaporates some of the cells and gives the cornea the necessary shape, carefully calculated in all parameters. Thus, the effect on the cornea occurs not on the surface, but in the middle layer, and the surgical site is protected by that epithelial flap, which was prudently raised and preserved. When the manipulation is complete, the doctor returns the flap of the cornea to its place and smoothes it.

The operation takes about ten minutes on each eye, including the installation of an eyelid speculum (it allows you to keep the eye open all the time), flap formation, laser correction and finally, placing the flap in its original place. Laser exposure lasts from 20 seconds to one and a half minutes on each eye - the duration depends on the degree of visual impairment [1]. The LASIK operation is painless. Moreover, even during a short rehabilitation period, the patient does not feel any discomfort or pain.

After the operation, antibacterial drops are instilled into the eye, the retainer is removed and the patient remains in the clinic for half an hour or an hour.

Read more about vision correction in articles on https://beregizrenie.ru/.

Answer 4
April, 2021

A thin layer of the cornea is cut with a laser, changing its curvature. You can do it if your vision has stabilized. Contraindicated if it continues to deteriorate.

I would like to advise the "tratak" method of restoring vision. With its help, I restored my vision to 100%, although before that I could not see the license plate from five meters. I wrote here somewhere a few days ago, too lazy to repeat myself. Search if you're interested ...

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